Abrasion-proof cast iron roll collar for straightening steel rail and preparation method thereof

A wear-resistant cast iron and roll ring technology, which is applied in the direction of rolls, metal rolling, manufacturing tools, etc., can solve the problems of easy cracks on the roll surface, high rail strength, and large deformation resistance, so as to achieve less processing and low production costs , the effect of high hardness and wear resistance

Inactive Publication Date: 2009-12-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of cast iron material has low toughness and high brittleness. When it is used for straightening rails, due to the high strength of the rails and high deformation resistance, the roll surface is prone to cracks and even peeling off.

Method used

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  • Abrasion-proof cast iron roll collar for straightening steel rail and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] ①Smelting outer cast iron: firstly mix ordinary scrap steel, graphite blocks, ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferroniobium, nickel plate and copper plate to heat and melt. After the molten iron is melted, add ferro-vanadium, and adjust the composition before the furnace to meet the requirements. After that, the temperature was raised to 1540℃, and then out of the furnace. During the outer layer of molten iron out of the furnace, 75Si-Fe and barium-containing Si-Fe (5-7% Ba, 65-70% Si, 0.8-1.5% Ca, 1.0-1.8 %Al, the remainder Fe) is used to inoculate the molten iron with the flow, and the rare earth magnesium alloy is used for the spheroidizing treatment by the flushing method. When the molten iron is 40-60% out of the furnace, the iron boron and iron tellurium are crushed to a small particle size of 6-10 mm. Blocks, wrapped in paper and thrown directly into the molten iron ladle, the molten iron can be poured after standing still and slagging off;...

Embodiment 2

[0043] ①Smelting outer cast iron: firstly mix ordinary scrap steel, graphite blocks, ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferroniobium, nickel plate and copper plate to heat and melt. After the molten iron is melted, add ferro-vanadium, and adjust the composition before the furnace to meet the requirements. After that, the temperature was raised to 1522℃, and then out of the furnace. During the outer layer of molten iron out of the furnace, 75Si-Fe and barium-containing Si-Fe (5-7% Ba, 65-70% Si, 0.8-1.5% Ca, 1.0-1.8 %Al, the remainder Fe) is used to inoculate the molten iron with the flow, and the rare earth magnesium alloy is used for the spheroidizing treatment by the flushing method. When the molten iron is 40-60% out of the furnace, the iron boron and iron tellurium are crushed to a small particle size of 6-10 mm. Blocks, wrapped in paper and thrown directly into the molten iron ladle, the molten iron can be poured after standing still and slagging off;...

Embodiment 3

[0052]①Smelting outer cast iron: firstly mix ordinary scrap steel, graphite blocks, ferrochrome, ferrosilicon, ferromanganese, ferromolybdenum, ferroniobium, nickel plate and copper plate to heat and melt. After the molten iron is melted, add ferro-vanadium, and adjust the composition before the furnace to meet the requirements Then the temperature was raised to 1549℃, and then out of the furnace. During the outer layer of molten iron out of the furnace, 75Si-Fe and barium-containing Si-Fe (5-7% Ba, 65-70% Si, 0.8-1.5% Ca, 1.0-1.8 %Al, the remainder Fe) is used to inoculate the molten iron with the flow, and the rare earth magnesium alloy is used for the spheroidizing treatment by the flushing method. When the molten iron is 40-60% out of the furnace, the iron boron and iron tellurium are crushed to a small particle size of 6-10 mm. Blocks, wrapped in paper and thrown directly into the molten iron ladle, the molten iron can be poured after standing still and slagging off;

[0053]...

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Abstract

The invention provides a wear resistant cast iron roll collar used for aligning a steel rail and a preparation method, which belong to the technical field of steel rail processing. The prior wear resistant cast iron roll collar used for aligning the steel rail has the defects of easy occurrence of cracks, complicated manufacture process and the like in quenching process. The method is to compound a wear resistant outer layer with a magnesium iron inner layer into an integral roll collar by centrifuge casting, wherein the wear resistant outer layer comprises the following ingredients in weight percentage: 3.0 to 3.4 percent of C, 1.5 to 2.0 percent of Si, 1.2 to 1.6 percent of Mn, 0.2 to 0.4 percent of Nb, 0.03 to 0.06 percent of RE, 0.03 to 0.06 percent of Mg, 2.5 to 3.0 percent of Ni, 0.4 to 0.6 percent of Mo, 0.8 to 1.2 percent of Cu, 1.5 to 1.8 percent of Cr, 1.0 to 1.4 percent of V, 0.03 to 0.08 percent of B, 0.002 to 0.005 percent of Te, 0.01 to 0.03 percent of Ba, less than or equal to 0.06 percent of P, less than 0.03 percent of S, and the balancing being Fe. The invention has the advantages of high hardness of the roll collar, good wear resistance, simple production process and low production cost.

Description

Technical field [0001] The invention belongs to the technical field of steel rail processing, and specifically relates to a centrifugal casting wear-resistant cast iron roll ring and a preparation method thereof, in particular to a wear-resistant cast iron roll ring for straightening steel rails and a preparation method thereof. Background technique [0002] Rail straightness is an important parameter that determines the service life of the rail and affects the running speed of the train. It is one of the important indicators for measuring the physical quality of the rail. It also directly affects the safety and comfort of train operation. Advanced rail manufacturing plants in various countries attach great importance to rail straightening technology. A variety of straightening methods have been developed for several major straightness defects of rails. In order to meet the needs of high-straightness rails for passenger dedicated lines and high-speed railways with speeds exceedin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D1/02B21B27/02C22C38/58C22C38/56B22D19/16C21C7/00
CPCY02P10/20
Inventor 符寒光雷永平宋国祥
Owner BEIJING UNIV OF TECH
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